Behringer VD1 Authentic Vintage-Style Distortion/Sustainer Authentic and classic distortion effectthe warm and emotive tone that has ruled rock for the last 30 years Dedicated Sustain control lets your guitar scream Status LED for effect On/Off and battery check True hard-wire bypass for ultimate signal integrity Runs on 9 V battery or the BEHRINGER PSU-SB DC power supply (not included)